I'm a Bionicle builder so I use the parts I'm the most familiar with which are Bionicle/Hero Factory pieces.
I hope you enjoy my MOC's
My Creations are sorted in the following folders.
Bionicle: Creations that use a majority of Bionicle Parts
Hero Factory: MOC's that are mostly made of Hero Factory pieces
Technic: Creations that don't use specific Bionicle/Hero Factory parts but only connector pieces and other ones found in technic sets
System: Creations made out of normal bricks or at least the majority of it
Combination/Alternative Models: MOC's made from 1 or more sets.